ASTM A312 TP310S Stainless Steel Seamless Pipe for Heat Exchanger Application
ASTM A312 TP310S, as a very important high alloy austenitic heat-resistant stainless steel pipe, is renowned for its excellent high-temperature oxidation resistance and good corrosion resistance, and is widely used in various oxidative environments. According to ASTM A312 standard requirements, seamless pipes and welded pipes can be produced. For high-temperature and high-pressure working environments, seamless pipes are more commonly used and cover a wide range of nominal pipe sizes. In terms of heat treatment, ASTM A312 stainless steel pipes are often supplied in a solution annealed state (heated to ≥ 1040 ° C and then rapidly cooled), with the aim of dissolving carbides, obtaining a uniform austenitic structure, optimizing corrosion resistance, and eliminating pipe stress.
ASTM A312 TP310S Stainless Steel Seamless Pipe Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| 310S | min. | – | – | – | – | – | 24.0 | – | 19.0 | – |
| max. | 0.08 | 2.00 | 1.50 | 0.045 | 0.030 | 26.0 | 22.0 |
The core of the composition design of TP310S stainless steel seamless pipe lies in high chromium and high nickel. High chromium provides the tube with top-level resistance to high temperature oxidation and peeling, and has extremely high resistance to high temperature corrosion in working environments with high sulfur content. The main reason is that chromium can form a dense and stable chromium oxide protective layer in high temperature environments; The high nickel content gives TP310S stainless steel seamless pipes a stable austenitic structure, preventing harmful phase transformations, and exhibiting good resistance to reducing acid corrosion. They can maintain good ductility and creep resistance at high temperatures, while also improving their resistance to carburization.
Equivalent Grades of 310S
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS |
| BS | En | No | Name |
| 310S | S31008 | 310S16 | - | 1.4845 | X8CrNi25-21 | 2361 | SUS 310S |
ASTM A312 TP310S Stainless Steel Seamless Pipe Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness |
| Rockwell B (HR B) max | Brinell (HB) max |
| TP310S | 515 | 205 | 40 | 95 | 217 |
ASTM A312 TP310S Stainless Steel Seamless Pipe Physical Properties
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Specific Heat 0-1000C (J/kg.K) | Electrical Resistivity (n.m) |
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C |
| 310S | 7750 | 200 | 15.9 | 16.2 | 17.0 | 14.2 | 18.7 | 500 | 720 |
ASTM A312 TP310S Stainless Steel Seamless Pipe Application
TP310S stainless steel seamless pipes are widely used in industrial fields that require long-term exposure to high-temperature oxidation environments:
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Heat treatment and metallurgical industry: furnace cans, muffle tubes, guide rails, material trays, radiation tubes, fan blades, hot air ducts, high-temperature fixtures, and material baskets for annealing furnaces, carburizing furnaces, tempering furnaces, and sintering furnaces.
- Petrochemical and chemical industries: components of ethylene cracking furnaces, hydrogen production conversion furnaces, reforming furnaces, high-temperature heat exchanger tubes, high-temperature reactor liners, and pipelines.
- Energy and Power: Superheater and reheater tubes for power plant boilers, superheater and evaporator tubes for waste incinerators, and components for heat recovery steam generators.
- Ceramic and glass industry: roller bars for kilns, furnace supports, burner nozzles, high-temperature conveying pipelines.
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Other: High temperature valves, flanges, expansion joints; High temperature sensor protective sleeve; Automotive exhaust system components.
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ASTM A312 TP310S Stainless Steel Seamless Pipe for Heat Exchanger Application Images
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